physics at a 100 tev collider

1

Physics at a 100 TeV Collider

Qi-Shu Yan (UCAS/CHEP,PKU)

Q.S.Yan(UCAS/CHEP) MC4BSM-2014, Daejeon, May 18-23

On behalf of MC working group for CEPCMonte Carlo Tools for Physics Beyond the Standard Model

18-23/May 2014, Deajeon,South Korea

MC4BSM-2014, Daejeon, May 18-23 2

Plan of this talk

• 1) Introduction to a 100 TeV collider• 2) Physics in a 100 TeV Collider• 3) On-going MC works for a 100 TeV Collider– 3.1) Quartic gauge coupling– 3.2) B’ search with Top and W taggers– 3.3) Higgs triple coupling [a Higgspair toolkit]

• 4) Conclusions

Q.S.Yan(UCAS/CHEP)

CEPC: Circular Electron-Positron Collider, Super-Proton-proton Collider


Sources https://twiki.cern.ch/twiki/bin/view/LHCPhysics/FutureHadroncollider http://indico.cern.ch/categoryDisplay.py?categId=525• Sources: Snowmass reports• International Workshop on Future High Energy Circular Colliders http://indico.ihep.ac.cn/conferenceOtherViews.py?view=standard&confId=3813

• FCC Study kickoff meetings (Feb. 12-15,2014,CERN) https://indico.cern.ch/event/282344/

• BSM Physics opportunities at 100TeV (Feb. 10-11,2014,CERN) http://indico.cern.ch/event/284800/

• CFHEP Kickoff Meeting (Feb. 23-24, 2014, IHEP, Beijing) http://indico.ihep.ac.cn/conferenceDisplay.py?confId=4068

• Physics at a 100 TeV collision (SLAC) https://indico.fnal.gov/conferenceDisplay.py?confId=7633

Q.S.Yan(UCAS/CHEP)

https://twiki.cern.ch/twiki/bin/view/LHCPhysics/FutureHadroncollider



http://indico.cern.ch/categoryDisplay.py?categId=525

http://indico.cern.ch/categoryDisplay.py?categId=525

http://indico.ihep.ac.cn/conferenceOtherViews.py?view=standard&confId=3813

http://indico.ihep.ac.cn/conferenceOtherViews.py?view=standard&confId=3813

https://indico.cern.ch/event/282344/

https://indico.cern.ch/event/282344/

http://indico.cern.ch/event/284800/

http://indico.cern.ch/event/284800/

http://indico.ihep.ac.cn/conferenceDisplay.py?confId=4068

http://indico.ihep.ac.cn/conferenceDisplay.py?confId=4068

https://indico.fnal.gov/conferenceDisplay.py?confId=7633

https://indico.fnal.gov/conferenceDisplay.py?confId=7633

MC4BSM-2014, Daejeon, May 18-23 4Q.S.Yan(UCAS/CHEP)

1) Introduction

What is our future?

Just before the restartingof LHC runII in 2015, please think

about it.


Adv. In luminosity at Higgs production rate and upgradeability for a pp collider,Circular Collider plans have been revitalized.

1308.6176, TLEP

1) Introduction


CERN base

SLACbase

CHEP base

When? Time scale?

7/10/30 years?

Where?

A synergy of global efforts of high energy community is dispensable.

Grow individual plans in a parallel way

1) IntroductionHow to make the dream come true?

A real 100 TeVcollider


Plan of Beijing base: CEPC

“Great Ring”, quoted from D. Gross

1) Introduction240 GeV

100 TeV

From Y.F. Wang’s talk

We are not supposed to do something easy.


One of potential sites in CEPC plan

The starting point of the Great Wall

1) Introduction

2 hours of flight between Seoul-Beijing

150 km


From XinChou Lou’s talk

CFHEP, CAS is established to conduct the plan. The center may go into a new international Lab after 2015.~3,000 particle physicists

1) Introduction


to strengthen collaborations between th. and exp. working groups and to form a strong and competitive

regional high energy community

1) Introduction

8 Subgroups


MC working group shall develop necessary MC tools and perform feasibility studies and provide important inputs for Detector Specifics and train workforce as well.

1) Introduction

We are matching forward!


Top factories, Higgs Factories, new mass range …

Snowmass QCD 1310.5180

2) Physics in a 100 TeV collider


From M. L. Mangano’s talk 2) Physics in a 100 TeV collider


From M.L. Mangano’s talk on 16/Dec/2013, Beijing

Detectors with good energy measurement and spatial resolution are needed.


From Rojo’s talk

t t scattering is possible at a 100 TeV collider in RS and composite models




Jesper’s talk

Electroweak Shower


& 1401.5238Collimated Weak Bosons


Snowmass:1311.0299

Andrea Wulzer’s talk

See Andreas Weiler’s talk


!00 TeV collider is discovery machineNew physics can be in a form of new Particles. Let’s find them by collisions.


The reach of excited Quarks,Jake Anderson’ talk

Tom Rizzo, 1403.5465



Snowmass 1311.0299

Andreas Weiler’s talk

New mass range 2) Physics in a 100 TeV collider


Simplified SUSY model, Snowmass:1311.0299


Triple Gauge Couplings Quartic Gauge Couplings

3.1) (a)Quartic gauge coupling

NonAbelian triple Gauge structure has been tested and confirmed!


LHC is a good place to test (a)QGC of NonAbelian structure of SU(2)xU(1)and new physics!


Feasibility study@LHC for (a)QGC via tri-lepton channelPileup mitigates the significance to a certain degree.

H. Qu, Y. Wen, D. Yang, QY, Q. Li, Y. Mao

S1 means only mZ with cut, S2 means same sign same flavor

3.1) Quartic gauge coupling

lv+4j @8TeV LHC 20fb-1cut method no PileUp, 0.099 sigma, PileUp 20, 0.085 sigma,BDT no PileUp, 0.14sigma, PileUp 20, 0.11sigma

lv+l'v+2j (OS OF) @8TeV LHC 20fb-1cut method no PileUp, 0.21 sigma, PileUp 20, 0.16 sigma,BDT no PileUp, 0.26sigma, PileUp 20, 0.20sigma

llvv+2J (SS) @8TeV LHC 20fb-1cut method no PileUp, 0.81 sigma, PileUp 20, 0.69 sigma,BDT no PileUp, 0.90sigma, PileUp 20, 0.79sigma

llvv+2J (SS) @14TeV LHC 100fb-1 cut method no PileUp, 1.55 sigma, PileUp 20, 1.12 sigma,BDT no PileUp, 1.76sigma, PileUp 20, 1.51sigma



H. Qu, Y. Wen, D. Yang, QY, Q. Li, Y. Mao



Simone, Matsedonskyi,Rattazzi,Wulzer, 1211.5663A first Top partner Hunter’s Guide

Andrea Wulzer’s talk

3.2) B’ search

Fully Hadronic channel is usually challenging due to huge SM background and high combinatorics

Taggers for boosted object could play a role to distinguish signal and background if b’ is heavy.

3.2) B’ search

Matteo Cacciaro’s talk on jet, Brock Tweedie’s talk on Jetsubstructure,Joe Juknevich’s for a top tagger

B’ signal search @LHC 14TeV with HEPtop and W taggersS. Yang, J. Jiang, QY, X. Zhao, 1405.2514

3.2) B’ search

B’ signal search @LHC 14TeV with top and w taggersS. Yang, J. Jiang, QY, X. Zhao, 1405.2514

2 TeV b’might bereachable.

3.2) B’ search

7-8 TeV b’might bereachablefor 100 TeVwith fully hadronicMode

Work ongoing

3.2) B’ search



Further analysis is ongoing. Single production signal, Pileup mitigation, top and W taggers at high Pt region, granularity of detectors as a benchmark for detector

specifics,…

The fully hadronic mode SS modes, …SS modes, …

3.2) B’ search

33

Proc. 14 TeV R(33) R(40) R(60) R(80) R(100)

tttt 5.3 fb 18.1 32.1 97.7 199.9 345.3

ttww 8.6 fb 9.1 14.2 35.3 64 102

Q.S.Yan(UCAS/CHEP) MC4BSM-2014, Daejeon, May 18-23

Background events not important at 14 TeV are significant at 100 TeVS. Yang, J. Jiang, QY, X. Zhao, works ongoing

3.3) Higgs triple coupling

Nice theoretical worksJ. Baglio, et.al. 1212.5581

D.Y. Shao, C.S. Li, H.T. Li, J. Wang, 1301.1245



Florian, Mazzitelli, 1309.6594

Ling, et.al., 1401.7754 (USTC, HeiFei)


The first fully exclusive accurate prediction for Higgs pair production plus one jetwith MLM matching

Q. Li, QY, X. Zhao, 1312.3830, P.Maierhofer, A. papaefstathiou 1401.0007,

R. Frederix. S. Frixione. F. Maltoni, O. Mattelaer, P. Torrielli, E. Vryonidou, M. Zaro, 1401.7340

A Higgpair toolkit for multiHiggs production starts to work


38Q.S.Yan(UCAS/CHEP) MC4BSM-2014, Daejeon, May 18-23


Comparison of aMC and GosamQ. Li, QY, Z. Zhao, X. Zhao, Extensions to new Higgs, ongoing

See Marco’s talk for aMC, Nicolas’s talk for Gosam

Higgspair toolkit future plan: UFO for BSM, NNLO(MEPS@NLO), …

Silvan’s talk for SherpaClaude’s talk for FeyRules

Higgs pair signal search @LHC 14TeV, ongoing works Q. Li, QY, Z. Zhao, X. Zhao


ttW 0.5 pb 3.7 4.9 8.4 12.1 15

ZW[dc] 12 pb 3.0 3.8 6.1 8.7 11.1

A gain in significance for HH is obvious!

More detailed analysis extended for 100 TeV is ongoingPileup contamination/Jet pruning, lepton tagging efficiency, etc….

From M.L. Mangano’s talk, 16/Dec/2013, Beijing



4. Conclusions• “The great ring” offers us great opportunities

for precision measurement and discovery of new physics

• Room for your contributions, ideas, … • New opportunities for MC development: high

precision (NLO/NNLO), discoveries of DM, computing technology, Higgs factory…

Q.S.Yan(UCAS/CHEP)

Soo-hyeon Nam’s talk for HTCaaS

Mihailo’s talk for madDMK.C. Kong, Zhenyu Han,D. Kim’s talk

Wolfgang’s talk for WhizardJamie’s talk for CheckMate

J.Lee’s talk for CPsuperH

Stephen’s talk for Pythia

David’s talk for HerwigBenjamin’s talk for Madanalysis

Kazaki’s talk for Atom

Alexander’s CalcHep

physics at a 100 tev collider

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